For me, 1 KHz bandpass for voice is unreadable. If the filter is very, very bad and the signal very strong, enough stuff outside of the 1 kHz bandpass might slip through to make it intelligible, but it's not as readable as a wider bandwidth along with the increased noise the wider bandwidth admits. Nor are you going to hear that much slip past a 1.0 kHz filter in a properly-working K3.
Once the bandpass drops below somewhere between 2.1 and 2.7 kHz (depending upon the voice) it takes a stronger signal to understand the voice. IMX, at around 1.5 kHz or so all intelligibility is lost. If you have a K3, all it takes is turning down the bandwidth below the width of your roofing filter to hear what happens. The KFL3A-1.0K filter is a "roofing filter" not the filter that sets your working bandpass. The working bandpass is set by the DSP filters, which are continuously adjustable within the limits of your roofing filter(s). Ron AC7AC From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of JD Sent: Friday, November 28, 2008 7:10 PM To: [email protected] Subject: [Elecraft] KFL3A-1.0K filter for voice??? Hello, Has anyone tried using the KFL3A-1.0K 1 kHz filter in situations of extremely close in stations? I realize the audio would be harsh but is it readable? Is it a viable filter for extreme conditions? Thanks, Jeff, N0OST
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